Sounds like you got it.
C-AF, FD = off, center point AF (I've also use 3x3 area AF), exposure mode PSAM.
Also: shutter to continuous LOW (in HIGH it will only AF on the first shot).
Some ideas:
I think the EM5-mk3 has PDAF. So that gives you a foot up for moving subjects vs. CDAF.
Next is how are YOU at holding the AF point on the moving subject. This is NOT easy.
The tighter I zoom, the harder I find it is to hold the AF point on the subject. So I back the zoom out a bit.
Tracking a moving subject requires practice, a LOT of practice. When I shoot a sport, for the first game or two of the season, I am getting back into the grove, from not shooting that game since last year. It is not until the 2nd and sometimes the 3rd game, that I am comfortable with tracking fast moving subjects.
Then you get subject that change directions or stop fast, and it is easy to overshoot the subject.
The closer the subject, the faster the apparent speed of movement, and the harder to track.
This may be the problem with your dog. It is close to you and moving fast.
Switching between subjects (from A to B) fast, and it is very easy to overshoot the 2nd subject.
Miss the subject, and you are focusing on the background. Been there, done that, a LOT.
The 3x3 area AF uses a 3x3 focus point box to AF in. This gives you a little bit of wiggle room, in the accuracy of your subject tracking.
There is no free lunch. The bigger the AF box, the more the AF can be affected by stuff other than your subject.
I rarely use tracking on my EM1-mk2. I found that it can often be fooled, in the sports that I shoot.
If you want to try tracking, you need to read then test HOW it works on YOUR camera for the sport YOU shoot.
Next is the lens. Some lenses do not focus FAST. So a fast moving subject, could be moving toward you faster than the lens can focus on it.
If the zoom ring is stiff, as you turn the zoom ring, you could push the AF point off the subject.
Next the subject.
If the subject is mono-toned (single color dog, single color jersey, etc.), the AF has nothing to lock focus on. The AF needs contrast to focus on.
Next is light.
Specifically the lack of it, at night and indoor games. The AF on many cameras have trouble in low light. As the light level drops, the contrast between bright and dark gets smaller. Slow lenses make the problem worse, because less light is getting to the AF system.
Next is weight.
Interestingly, I found that if the camera+lens is too light, it is harder for me to hold onto and track a fast moving subject.
Weight seems to dampen my natural body wobble, making tracking easier.
But then when my arms get tired, from holding the heavy gear, the wobble increases. So there is a balance.
Next is stance.
The correct stance makes it easier to track a moving subject.
You want to keep your feet planted and rotate your hip and upper body, like a shotgun shooter will track a skeet target.
You do NOT want to move your feet, as that upsets everything. You only move your feet when you hit the limit of your rotation.
So, you have to plan where to put your feet, so that you can rotate your body without having to move your feet.
That is all that I can think of now.
